ASTM A517Gr.P quenched and tempered steel plates supplier

A517 Grade P: start with vessel duty and the 4 in. limit

ASTM A517 Grade P is a high-strength quenched-and-tempered alloy plate grade for fusion-welded boilers and other pressure vessels. The A517/A517M-17(2023) public Scope limits Grade P to 4 in. [100 mm]. This is a specification ceiling, not a statement of Gangsteel stock or a promise that every dimension can be supplied.

The official public abstract identifies killed steel meeting fine austenitic grain size requirements, with analyses, tension testing and transverse Charpy V-notch testing. A Grade P enquiry therefore needs the pressure-vessel specification and testing basis, not just a grade letter or a generic request for quenched-and-tempered plate.

Keep Grade P within its own specification range

The table is the official public-Scope thickness framework, not a list of products offered. Inch-pound and SI are independent systems; the bracketed limits are not exact conversions to mix in an order. Grade Q’s larger ceiling does not extend the Grade P limit.

The same Scope says the A517 grades share mechanical properties and general characteristics. That does not make the grades interchangeable: their alloy chemistry and permitted thickness differ. Choose Grade P because it is the material specified for the component, not because one strength result resembles another grade.

Grade P heat-analysis reference for a quotation

ArcelorMittal USA’s public A514 and T-1 brochure, available in a 2021 PDF, has a separate A517 Grade P column. The following values are its heat-style mill restatement, not a certified extract of the current ASTM chemistry table or a finished-product analysis table. The P/S maxima retain that brochure basis.

That column does not list vanadium, titanium, zirconium or copper as required Grade P additions. An unlisted addition is not a zero-content guarantee. Obtain the applicable analysis requirements if the project needs additional element reporting or tighter chemistry.

Heat analysis represents the steel heat; product analysis evaluates finished material under the applicable analysis provisions. Product-analysis acceptance requires its applicable sampling provisions and tolerances, rather than a widened heat range. State the specification edition and the required analysis reports on the enquiry, and review actual results on their proper basis.

Strength references must remain thickness-banded

The strength pattern is a mill restatement, not an official ASTM mechanical-table extract. The AM Grade P brochure distinguishes the 4 in. specification limit from its own offering maximum of 3.33 in.; its supplied thicker band extends only to that mill range. The extended reference above remains conditional on the ordered requirements and actual supply agreement, not an availability or performance promise for every size up to the ceiling.

The table uses ksi deliberately. Any SI requirement, elongation value, gauge length and specimen basis must follow the ordered specification rather than an assumed conversion or a result copied from a structural grade. The Grade P mill comparison column does not provide a complete elongation acceptance table.

Transverse Charpy testing: define the acceptance conditions

The official A517 public abstract calls for tension and transverse Charpy V-notch tests. Recognizing that test requirement is different from assigning a universal test temperature or impact energy. Establish the applicable conditions and criteria under the ordered edition and project requirements before comparing offers.

An impact report should identify the material, specimen orientation, test temperature, reported results and the acceptance basis used. Where an agreed specimen treatment is required to represent later fabrication, identify that condition as well. A generic “impact tested” statement does not show whether the particular purchasing requirement has been met.

Other plate routes are not Grade P equivalents

ASTM A514 Grade P steel plate is structural Q&T alloy plate under a different specification. Even where chemistry is similar, the mill literature distinguishes A514’s structural delivery basis from A517’s pressure-vessel basis and strength references. A matching letter does not establish dual certification. ASTM A514 Grade Q steel plate is likewise a structural material, not another name for A517 Grade P.

Other vessel-plate families include ASTM A537 Class 2 steel plate for its Q&T class, ASTM A537 Class 1 steel plate for normalized delivery, and ASTM A516 Grade 70 steel plate. Use their own requirements when the design specifies them; a shared vessel application is not a substitution rule.

Put the fabrication and document scope on the enquiry

State the plate dimensions, quantity and Q&T condition with the material designation. Include the required analyses, tension and impact testing, supplementary examinations and material documents. If subsequent heat treatment or welding is involved, the responsible fabrication team needs a suitable procedure and any agreed testing representation; the grade name is not a preheat, tempering or PWHT recipe.

Buyer questions about procuring A517 Grade P

What is the maximum thickness identified for Grade P?

The A517/A517M-17(2023) public Scope gives Grade P a maximum of 4 in. [100 mm], using independent unit systems. A mill’s offering can be smaller, and the official ceiling is not a stock statement. Give the exact dimensions and ordered edition so the actual supply requirement can be assessed.

Do shared A517 mechanical properties make Grade Q interchangeable with P?

No. The public Scope describes shared mechanical properties and general characteristics, but the grades have different chemistry and thickness ceilings. Grade Q’s larger permitted thickness does not change Grade P. Retain the grade selected by the design unless a responsible engineering review authorizes a documented material change.

Can a heat-analysis reference be used as product-analysis acceptance?

Not by relabelling it. Heat and product analyses have different sampling and acceptance provisions. The published mill table provides chemistry context for a quotation, not a complete current-edition product-analysis requirement. Identify the applicable edition and reporting scope, then assess the finished-product results under their proper rules.

Does the Charpy requirement imply a fixed energy or test temperature?

No universal number follows from the grade name. The official public abstract requires transverse Charpy V-notch testing, but its public Scope does not provide numerical acceptance conditions. Use the ordered edition and project requirements to establish temperature and criteria, then relate the report to those conditions and the identified material.

Can an A514 Grade P certificate be used for an A517 Grade P order?

The matching letter is not sufficient. A514 addresses structural plate; A517 addresses pressure-vessel plate with its own requirements. Review any proposed dual certification explicitly against the required specifications and documentation. Do not accept a structural designation as a vessel-plate substitute solely because chemistry or a tensile result appears similar.